Most of the examples are for sense 4.

gg5, prog, daij

I see no meaningful distinction between senses 1 and 2. Only GG5 has this split. I think they can be merged.
I don't think the last two senses (in this amendment) are ever standalone nouns in modern Japanese.
I don't think the archaic senses are needed.

@@ -20,4 +20,2 @@
-<gloss>rack</gloss>
-<gloss>table</gloss>
-<gloss>bench</gloss>
-<gloss>podium</gloss>
+<gloss>rest</gloss>
+<gloss>base</gloss>
@@ -26 +24,4 @@
-<gloss>stage</gloss>
+<gloss>table</gloss>
+<gloss>holder</gloss>
+<gloss>support</gloss>
+<gloss>rack</gloss>
@@ -30,4 +31,7 @@
-<pos>&n-suf;</pos>
-<gloss>support</gloss>
-<gloss>holder</gloss>
-<gloss>rack</gloss>
+<gloss>setting (of a gem)</gloss>
+<gloss>mounting</gloss>
+</sense>
+<sense>
+<pos>&n;</pos>
+<xref type="see" seq="1412800">台木・1</xref>
+<gloss>stock (in grafting)</gloss>
@@ -37 +41 @@
-<gloss>counter for machines, incl. vehicles</gloss>
+<gloss>counter for machines and vehicles</gloss>
@@ -40,2 +44,6 @@
-<pos>&n;</pos>
-<gloss>setting (e.g. in jewellery)</gloss>
+<pos>&suf;</pos>
+<s_inf>after a rounded value</s_inf>
+<gloss>level (e.g. price level)</gloss>
+<gloss>mark</gloss>
+<gloss>range</gloss>
+<gloss>decade (of one's life)</gloss>
@@ -44 +51,0 @@
-<pos>&n;</pos>
@@ -46,6 +53,2 @@
-<pos>&ctr;</pos>
-<xref type="see" seq="1982860">代・だい・2</xref>
-<xref type="see" seq="1982860">代・だい・6</xref>
-<gloss>level (e.g. price level)</gloss>
-<gloss>range (e.g. after physical units)</gloss>
-<gloss>period (of time, e.g. a decade of one's life)</gloss>
+<gloss>tall building (with a fine view)</gloss>
+<gloss>(observation) platform</gloss>
@@ -54,4 +57,2 @@
-<pos>&n;</pos>
-<xref type="see" seq="1412710">台地</xref>
-<s_inf>oft. in place names</s_inf>
-<gloss>elevated area</gloss>
+<pos>&n-suf;</pos>
+<s_inf>in place names</s_inf>
@@ -59,21 +60 @@
-</sense>
-<sense>
-<pos>&n;</pos>
-<gloss>viewing platform</gloss>
-</sense>
-<sense>
-<pos>&n;</pos>
-<xref type="see" seq="2817720">台盤・1</xref>
-<gloss>dish tray</gloss>
-</sense>
-<sense>
-<pos>&n;</pos>
-<misc>&arch;</misc>
-<gloss>meal</gloss>
-</sense>
-<sense>
-<pos>&n;</pos>
-<xref type="see" seq="1809380">高殿</xref>
-<misc>&arch;</misc>
-<gloss>tall building</gloss>
-<gloss>tower</gloss>
+<gloss>heights</gloss>

It's related to sense 1, but probably better separate.

@@ -56,2 +56 @@
-<misc>&abbr;</misc>
-<s_inf>oft. as a suffix in place names</s_inf>
+<s_inf>oft. in place names</s_inf>

https://ja.wikipedia.org/wiki/台 以上のほか、台地・丘陵を示す地名の接尾辞。特に新興住宅地に多い（青葉台など）が、デベロッパーによる開発分譲地の場合、まったくの平地に命名されることも多い。
https://uub.jp/nam/marumarudai.html 新興住宅地に盛んに「○○台」と名づけられるようになったのは、時期的には「○○ヶ丘」と同じかもう少し遅い頃、戦後の高度成長期以降でしょう。1962年に完成した千里ニュータウンの吹田市側の全ての町に「○○台」と名付けられたのが、「○○台」ブームの先駆ではないかと思われます。以来「町名の○○台」は全国に広がり、現在もなお新たな「○○台」が続々と誕生していています。

@@ -54,0 +55,3 @@
+<xref type="see" seq="1412710">台地</xref>
+<misc>&abbr;</misc>
+<s_inf>oft. as a suffix in place names</s_inf>
@@ -55,0 +59 @@
+<gloss>plateau</gloss>

Seems OK. It's the first 3 senses that matter.

@@ -63 +63 @@
-<xref type="see" seq="2817720">台盤</xref>
+<xref type="see" seq="2817720">台盤・1</xref>